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English definition of “flatten”

flatten

verb [I or T] (BECOME LEVEL)    /ˈflæt.ən/ US  /ˈflæt̬-/
C2 to become level or cause something to become level: Several trees were flattened (= knocked down) by the storm. The path flattens (out) (= does not go up so much) as it reaches the top of the hill.Making things more or less smooth or straight
(Definition of flatten verb (BECOME LEVEL) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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